39 29 USC § 163
et seq. While there is no explicit authorization for lockouts under the
National Labor Relations Act, the National Labor Relations Board has allowed
employers to withhold work from employees as a means of putting economic
pressure on workers during the course of negotiations. For a discussion of this
topic, see Patrick Hardin and John E. Higgins, The Developing Labor
Law Fourth Ed., Vol. II, 1511-1543 (Bureau of National Affairs,
2001).